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(Im not sure where to put this post so Im sorry if it is in the wrong place) All of my male Madagascar Hissing Cockroaches are seperated into individual enclosures. They have never spent more than a day together (and thats just two at a time during shipping) but their enclosures take up a lot of space in my room (not like a lot but two shelves could have a lot more use) and I want to see if I could put them into the 15 gallon tank I have. I have notes on each individual in terms of behaviors and things like that since I like to learn about them and theyre primarily observational pets for me. I was wondering if there was a way for me to mark them to know who is who after i put all three of them in the enclosure (the fourth seems very old and I dont want them to beat him up lol) I was thinking something like a sticker between their little horns would be the easiest but I don't want to do anything that would harm them so I was just wondering if that would work or if there is something else I could do. Also are there any suggestions to try and limit any fighting that might happen between three males? Thanks!